What U.S. monument marks the point where Arizona, Colorado, New Mexico, and Utah meet?

The Four Corners Monument marks the point where Arizona, Colorado, New Mexico and Utah meet.

It stands on the Colorado Plateau in the southwestern United States and marks the country’s only point where four states meet at a single point. The monument is administered as a tourist attraction by the Navajo Nation, whose reservation surrounds much of the area.

The boundaries originated in congressional territorial legislation during the 19th century. Surveyors later marked the lines on the ground, and those physical markers became legally significant even though some do not perfectly match modern mathematical meridians and parallels. A 1925 U.S. Supreme Court decision upheld the surveyed markers as the legal boundaries.

The site also involves Native American jurisdictions: the Navajo Nation and Ute Mountain Ute Tribe have boundaries at the monument. Visitors commonly pose with a hand or foot in each state, but the monument is more than a photo stop—it reflects the complicated history of territorial creation, surveying and Indigenous land.